There have been a few attempts to bring these characters back to comics and they all fail. Is it the characters themselves? Was it DC trying to start a Marvel style line of comics but the market was flooded at the time? Was is internal issues at DC that caused problems? Was it just marketed poorly?
I got my hands on some of them recently and they aren't terrible. I worked in a comic store back when they were being published and I recall they didn't sell well at all. It seemed like a good idea to get younger readers into comics by offering affordable "new" titles.